Omit joining lines in matplotlib plot e.g. y = tan(x)

Question

I have the graph y = tan(x) and I want to remove the vertical lines (see below).

Here is my code:

import numpy as np
import matplotlib.p         


        

Answer 1

One could use the definition of the tangent to filter out those points where the cosine of x is close enough to 0.

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 4*np.pi, 666)
y = np.tan(x)

y[np.abs(np.cos(x)) <= np.abs(np.sin(x[1]-x[0]))] = np.nan

plt.plot(x, y)
plt.ylim(-3,3)

plt.show()

This works for equally spaced data only.